This short video tutorial from GSi shows how to manually install a virtual instrument in OSX Lion, and it takes VB3 AU as an example, but the same procedure is valid for both AU and VST formats and works in Mountain Lion too.

The problem with OSX from 10.7 is that the USER LIBRARY is hidden by default. You have to press the OPTION KEY onto your computer keyboard while viewing the Finder "GO" menu, and the menu item "Library" will magically appear!

Also, it is necessary that you are logged in as an administrator user in order to set the proper permissions to files and folders.

Video Tutorial: How to manually install a plug-in in OSX Mountain Lion

In this other video I'm doing the same install on a different Mac, this time the OSX is version 10.8.3 and the host I'm using for testing the installation is Mainstage 2.
Sometimes it's not necessary to correct the permissions, and in fact I'm skipping that passage in this video.

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So please contact us only if you have to ask something that is not already in the F.A.Q.'s or in the manuals. Thanks.

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If you're wondering why we still don't have 64 bit updates for our plugins, please don't ask... we are late with updates and we feel guilty, but we ask you to be patient because it's in our
plans to update all our plugin line to 64 bit as soon as we can.